Back in England, Jack Aubrey receives a commodore’s broad pennant and command of a squadron sent to West Africa. Its public mission is to suppress the slave trade, while its concealed purpose is to prepare for action against a possible French expedition to Ireland.
Stephen Maturin faces a family crisis after Diana disappears and their daughter withdraws from communication. At sea, disease, command rivalry and the brutality of slave ships test Jack’s squadron before the mission shifts north toward Ireland.